#!/user/bin/env node

const log = console.log,
      err = console.error,
      arg = process.argv[2];

if(typeof(arg) == 'undefined'){
  err('缺少命令行参数');
  process.exit(1);
}

if(isNaN(Number(arg))){
  err('命令行参数不是合法数字');
  process.exit(2);
}

log('退出码',arg);
process.exit(arg);

